RAW is also being rendered to default settings within the IDC, and these settings are obviously different from those the camera JPEG engine. RAW rendering is simply giving you a starting point.
This. Only shoot RAW if you want to post process. I've found that I can post process and get a better image than relying on the formula that Sony engineers have coded for how they'll take a RAW image and compress it down into a JPG. JPG is a lot faster for people who don't want to deal with post processing so that is an advantage. But for people who know post processing and who want to get the best final product then processing the RAW file in Lightroom or another application can often result in a higher quality image.